Escher's "Waterfall" in LEGO®

Because The LEGO Company get paranoid about this sort of thing let me make it clear that I have no affiliation with them, that my views are my own and do not necessarily represent theirs,
and so on. So if you think any of this is official you are as deluded as they are.

OK, let's come clean. We actually resorted to photographic manipulation for this one. The model as built has the right-hand tower in the background. The water channels running from bottom
left to top right are genuine and connect the two towers as shown. But the channels running bottom right to top left are actually only connected to the left-hand (near) tower. We took two
photographs of the model; one with and one without these channels, but from the identical viewpoint:

The final image was constructed by very carefully overlaying portions of the left image with the corresponding portions from the right. Yes, it's dirty. We couldn't see how else to do it. Sorry.

To make up for the gross cheating, the model does have a number of interesting construction details. Here are some highlights (click on the small pictures for larger versions):

Here's an overall view, showing the genuine water channels between the two towers and the false ones that lead nowhere. You can also see some of the
Technic framework used to support the raised parts of the model.

The decorations on top of the towers were a bit of a challenge. We spent quite some time trying various alternatives. In fact, when originally planning this
model, this was one of the big three problems we thought we needed to solve (the other two were the overall 'impossible building' construction and the
waterfall itself) In Escher's original picture, the object on top of the left-hand tower is an intersection of three cubes. I couldn't quite manage that in Lego,
but with judicious use of roof pieces (lots of 1x2 double/inverted slopes, 2x2 corner slopes and 2x2 double concave slopes), I did manage to construct an
intersection of three cuboids. Close enough. Escher's other tower is topped by three intersecting octahedra. I just wimped out here and hacked together
something vaguely geometric-looking. Both of the lego constructions are achieved by joining together six identical constructions on the faces of a cube. Oh,
the uses for those1x1 bricks with studs on the sides...

The garden in the Escher original has some pretty weird plants in it. So here's a slightly unusual use for Technic bendy tubes and rocket engine pieces...

This little staircase was a bit of a challenge. It was hard fitting enough steps into the limited space available in the model. In the end we used half-brick
spacing, using an obscene number of yellow 1x2 jumper plates in the process. The problem is that inevitably there will be a half-stud gap somewhere. I had
just enough jumpers to hide it away out of sight...

There are two interesting features in this picture; the waterfall and the roof of the millhouse.

The waterfall itself was about an evening's work. I started by writing some C code to model a gradually widening parabolic arch with random variations for
the spray (hacked from the code I use for my mathematical Lego sculptures) and then gradually modified it by hand until I liked the look of the result.

The roof was originally constructed with standard slope bricks, but we wanted to model the rough tiled look of Escher's picture. The general construction is
blatantly stolen from a roof construction method I had noticed at Legoland Windsor, though I simplified it a bit for this model. The entire roof is built of
brown plates, and pretty much exhausted my collection.

The washing line. Well, we thought it was cool ;-). The line itself was temporarily borrowed from a large pirate ship...

All M. C. Escher works (C) Cordon Art, Baarn, the Netherlands. All rights reserved. Used by permission.The official M.C. Escher web siteis worth a visit. In particular they have a "virtual ride" through "Ascending
and Descending".